<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>语义化标签</title>
    <style>
        header {
            height: 100px;
            background-color: aliceblue;
        }
        input::placeholder {
            color: blue;
        }
    </style>
</head>
<body>
    <!-- <header>11111</header>
    <aside>1111</aside>
    <section>
        <video src="https://www.runoob.com/try/demo_source/movie.mp4" poster="images/jpg/小熊.jpg" muted></video>
    </section>
    <article>444444</article> -->
    <!-- <form action="">
        <ul>
            <li>邮箱: <input type="email"></li>
            <li>网址: <input type="url"></li>
            <li>日期: <input type="date"></li>
            <li>日期: <input type="time"></li>
            <li>数量: <input type="number"></li>
            <li>手机号码: <input type="tel"></li>
            <li>搜索: <input type="search"></li>
            <li>颜色: <input type="color"></li>
            <li><input type="submit" value="递交"></li>
        </ul>
    </form> -->
    <form action="https://www.runoob.com/html/html5-form-input-types.html">
        <ul>
            <li><input type="text" required placeholder="xiaoxiong" autofocus autocomplete=></li>
            <li><input type="submit" value="提交"></li>
        </ul>
    </form>
</body>
</html>